A method, device and storage medium for continuous casting slab cutting control

Abstract

The present invention provides a method for online automatic cutting control of continuous casting billets, comprising the following steps: real-time acquisition of runner furnace start and end position information and cutting plan information; real-time acquisition of billet information in the runner, i.e., remaining billet length, predefined casting length information corresponding to the billet head and the billet tail calculated according to the steel type or production plan and optimization event; real-time acquisition of cutting information in the runner, recording the casting length during cutting and the position information of the cutter; real-time acquisition of photoelectric detection information in the runner, when the photoelectric detection signal changes from on to off, the billet head just reaches the photoelectric detection point, and the difference between the tracking billet length value and the actual billet length corresponding to the detection point is recorded as the correction length; according to the cutting plan or the cutting length after cutting optimization, a suitable correction point and a corresponding correction value are selected, and the tracking billet length is obtained according to the correction value, and when the tracking billet length reaches the predetermined requirement, the pre-pressing and main pressing instructions are issued to realize automatic cutting control.

Description

Technical Field

[0001] The invention belongs to the technical field of continuous casting production process in steel mills, and relates to a method, equipment and storage medium for cutting control of continuous casting ingots. Background Art

[0002] In the continuous casting process, infrared cameras + control systems are usually used to control the length of the cut ingot. When the control system detects that the ingot length has reached the target position, it issues corresponding pre-pressing and main pressing instructions to the cutter, thereby achieving the control of ingot online cutting.

[0003] In the actual production process, due to the existence of changing the middle package, stopping the machine, raising and lowering the pulling speed, etc., the surface brightness of the ingot produced at this time varies greatly, which causes the length deviation recognized by the infrared camera and the control system to increase, and then causes the length deviation of the cut ingot to increase. At this time, it is necessary to manually adjust the recognition brightness of the control system to increase or decrease the control length of the cut ingot. When the length of the produced ingot is inconsistent with the target length, the operator is required to adjust the recognition brightness again. This operation mode has lag and affects the smooth production. At the same time, due to the differences in the brightness control operations of each operator, the length deviation of the cut ingot is large, usually with a deviation of about 10-20 cm from the target ingot.

[0004] The effective recognition range of an infrared camera is usually about 2-3 meters. If the cutting length of a flow channel to be controlled is 5-11 meters, three cameras need to be deployed. The purchase cost of related professional equipment is high, and its production and maintenance costs are also relatively high. In addition, due to the limited detection range, the control length range of the system is limited, which is not conducive to expansion and actual production control.

[0005] Currently, there is no technology or patent literature related to computer-downloaded cutting control instructions. Summary of the invention

[0006] In order to solve the above problems, the present invention is proposed: a method for online automatic cutting control of continuous casting billets, the technical solution comprises the following steps:

[0007] Obtain the start and end position information of the flow channel furnace and the cutting plan information in real time;

[0008] Real-time acquisition of ingot information in the runner, i.e., the remaining ingot length, and the casting length information corresponding to the predefined ingot head and tail calculated according to the steel grade or production plan and optimization events;

[0009] Obtain the cutting information in the runner in real time, and record the casting length and cutting machine position information during cutting;

[0010] The photoelectric detection information in the flow channel is obtained in real time. When the photoelectric detection signal changes from on to off, the head of the billet just reaches the photoelectric detection point. The difference between the tracking billet length value and the actual billet length corresponding to the detection point is recorded as the correction length.

[0011] According to the cutting plan or the cutting length after optimization, select the appropriate correction point and the corresponding correction value, and combine the correction value to obtain the tracking length of the ingot corresponding to the cutting position. When the tracking length of the ingot reaches the predetermined requirement, issue pre-pressing and main pressing instructions to the cutting machine to realize automatic cutting control.

[0012] Furthermore: this method is applicable to the automatic cutting mode. After completing one cut, the cutting machine will automatically return to its original position, receive and execute the pre-pressing and main pressing instructions of the host computer, and automatically complete the subsequent cutting process.

[0013] Furthermore: the photoelectric tube detection point, the length of the cut ingot is usually about 8-11 meters, and the photoelectric detection point is located at a position of about 7.5 meters, 9.0 meters or 10.8 meters from the rear end of the cutting machine.

[0014] Furthermore: when the head of the continuous casting billet reaches the photoelectric detection point, the photoelectric signal changes from on to off, and the difference between the actual billet length and the tracking length corresponding to the calibration point is recorded.

[0015] Furthermore: the appropriate correction point is selected based on the difference and in combination with the cutting optimization calculation result, and a photoelectric correction point closest to the predefined slab planned cutting point is selected.

[0016] Further: based on the selected correction point, the difference is obtained, combined with the position of the tail of the frontmost ingot, and when the tracking tail plus the difference reaches the pre-pressing and main pressing positions, a corresponding instruction is issued.

[0017] A casting blank online cutting device comprises a photoelectric tube, a processor and a memory, wherein the casting blank online cutting method as described in any one of the above items is implemented when the processor executes the computer program stored in the memory.

[0018] A computer-readable storage medium is used to store a computer program, wherein when the computer program is executed by a processor, the method for online automatic cutting control as described in any one of the above items is implemented.

[0019] The present invention provides a method, device and storage medium for online automatic cutting control of continuous casting billets. Based on the casting strand tracking length, combined with the photoelectric tube detection signal at a fixed position, the length of the billet is dynamically calculated and tracked through a computer algorithm. When the length reaches the requirement, the computer issues pre-pressing and main pressing instructions to achieve automatic control of billet cutting. Through this technology, the differences between different operators can be avoided, while the workload of operators can be reduced, and the stability of production and the accuracy of billet length control can be improved.

[0020] The present invention can realize automatic cutting control of produced ingots without a traditional infrared control system, and the range of controlled length is larger than before, the operation is simpler, fewer devices are used, and the control accuracy is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 is a flow chart of the method. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0027] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0030] Figure 1 is a flow chart of the method;

[0031] A method for online automatic cutting control of continuous casting ingots, comprising the following steps:

[0032] S1: Real-time acquisition of runner furnace start and end position information and cutting plan information;

[0033] S2: Real-time acquisition of the ingot information in the runner, and the casting length information corresponding to the predefined ingot head and the casting length information corresponding to the ingot tail calculated according to the cutting production plan, optimization events, and steel grade cutting optimization requirements;

[0034] S3: Real-time acquisition of cutting information in the runner, recording the casting length and cutting machine position information during cutting;

[0035] S4: Real-time acquisition of photoelectric detection information in the flow channel. When the photoelectric detection signal changes from on to off, the head of the billet just reaches the photoelectric detection point. The difference between the tracking billet length value at this time and the actual billet length corresponding to the detection point is recorded as the correction length.

[0036] S5: According to the cutting plan or the cutting length after cutting optimization, select the appropriate correction point and the corresponding correction value, and combine the correction value to obtain the tracking length of the ingot corresponding to the cutting position. When the tracking length of the ingot reaches the predetermined requirement, issue pre-pressing and main pressing instructions to the cutting machine to realize automatic cutting control.

[0037] Steps S1, S2, S3, S4 and S5 are performed sequentially;

[0038] Furthermore: this method is applicable to the automatic cutting mode. After completing one cut, the cutting machine will automatically return to its original position, receive and execute the pre-pressing and main pressing instructions of the host computer, and automatically complete the subsequent cutting process.

[0039] Furthermore: the photoelectric tube detection point, the length of the cut ingot is usually about 8-11 meters, and the photoelectric detection point is located at a position of about 7.5 meters, 9.0 meters or 10.8 meters from the rear end of the cutting machine.

[0040] Furthermore: when the head of the continuous casting billet reaches the photoelectric detection point, the photoelectric signal changes from on to off, and the difference between the actual billet length and the tracking length corresponding to the calibration point is recorded.

[0041] Furthermore, according to the optimized cutting plan, a detection point closest to the next cutting point is selected for correction.

[0042] Further: based on the selected correction point, the difference is obtained, combined with the position of the tail of the frontmost ingot, and when the position of the tail in the flow channel plus the difference reaches the pre-pressure and main pressure positions, a corresponding instruction is issued.

[0043] A casting blank online cutting device comprises a photoelectric tube, a processor and a memory, wherein the processor implements any casting blank online cutting method as described in any one of the above when executing a computer program stored in the memory.

[0044] A computer-readable storage medium is used to store a computer program, wherein when the computer program is executed by a processor, the method for online automatic cutting control as described in any one of the above is implemented.

[0045] Example 1

[0046] For the case where the target billet length is 8.3 meters, the 7.5-meter detection point will be selected for calibration. The implementation steps are as follows:

[0047] S1: Real-time acquisition of runner furnace start and end position information and cutting plan information;

[0048] S2: Real-time acquisition of the ingot information in the runner, and the casting length information corresponding to the predefined ingot head and the casting length information corresponding to the ingot tail calculated according to the cutting production plan, optimization events, and steel grade cutting optimization requirements;

[0049] S3: Real-time acquisition of cutting information in the runner, recording the casting length and cutting machine position information during cutting;

[0050] S4: When the billet reaches 7.5 meters after the cutting machine, the photoelectric detection signal will change from on to off;

[0051] Record the difference between the tracking length at this time and the tracking length during the last main pressure. For example, if it is 7.6 meters, it means that the tracking value is 0.1 meters longer than the actual billet.

[0052] S5: When the difference between the tracking length and the tracking length during the last main pressing reaches 8.4 meters (i.e. plus 0.1 meters), the main pressing command is issued to deduct the tracking value deviation before 7.5 meters, so that the cut ingot length is more accurate.

[0053] Embodiment 2:

[0054] For the case where the target billet length is 11.05 meters, the detection point of 10.8 meters will be selected for correction. The implementation steps are as follows:

[0055] S1: Real-time acquisition of runner furnace start and end position information and cutting plan information;

[0056] S2: Real-time acquisition of the ingot information in the runner, and the casting length information corresponding to the predefined ingot head and the casting length information corresponding to the ingot tail calculated according to the cutting production plan, optimization events, and steel grade cutting optimization requirements;

[0057] S3: Real-time acquisition of cutting information in the runner, recording the casting length and cutting machine position information during cutting;

[0058] S4: When the billet reaches 10.8 meters after the cutting machine, the photoelectric detection signal will change from on to off;

[0059] Record the difference between the tracking length at this time and the tracking length during the last main pressure. For example, if it is 10.6 meters, it means that the tracking value is 0.2 meters shorter than the actual casting billet.

[0060] S5: When the difference between the tracking length and the tracking length during the last main pressing reaches 10.85 meters (i.e., minus the short 0.2 meters), the main pressing command is issued to deduct the tracking value deviation before 10.8 meters, so that the cut ingot length is more accurate.

[0061] Embodiment 3:

[0062] S1: Real-time acquisition of runner furnace start and end position information and cutting plan information;

[0063] S2: Real-time acquisition of the ingot information in the runner, and the casting length information corresponding to the predefined ingot head and the casting length information corresponding to the ingot tail calculated according to the cutting production plan, optimization events, and steel grade cutting optimization requirements;

[0064] For abnormal optimization events, such as the optimization of the first casting, the implementation steps are as follows:

[0065] When pouring begins, collect the corresponding optimization events;

[0066] According to the optimization requirements of the casting steel type, the optimization parameters are obtained. For example, the cutting head of the casting steel type is optimized to 3 meters, and the head billet length is the target fixed length;

[0067] Get the cutting plan for the casting furnace, for example, the target length is 11 meters;

[0068] The optimal length for cutting the head blank is 11 meters plus 3 meters, which means a total of 14 meters.

[0069] S3: Real-time acquisition of cutting information in the runner, recording the casting length and cutting machine position information during cutting;

[0070] S4: When the head of the ingot reaches 10.8 meters behind the cutting machine, the photoelectric detection signal will change from on to off;

[0071] Record the difference between the tracking length at this time and the tracking length during the last main pressure. For example, if it is 10.6 meters, it means that the tracking value is 0.2 meters shorter than the actual casting billet.

[0072] S5: When the difference between the tracking length and the tracking length during the last main pressing reaches 13.8 meters (i.e., minus the short 0.2 meters), the main pressing command is issued to deduct the tracking value deviation before 10.8 meters, so that the cut ingot length is more accurate.

[0073] The invention was designed, developed and implemented by the applicant himself, and was first applied in the 1930 and 1650 continuous casting machines of the steel plant of Xichang Steel and Vanadium Company of Panzhihua Iron and Steel Group in May 2023. When using this method for cutting control, there is no need to manually adjust the brightness of the camera or perform length compensation. The length accuracy of the cut ingot is within 2 cm.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for online automatic cutting control of continuous casting ingots, characterized in that: The following steps are involved: Obtain the start and end position information of the flow channel furnace and the cutting plan information in real time; Real-time acquisition of the ingot information in the runner, i.e., the remaining ingot length, the casting length information corresponding to the predefined ingot head and the casting length information corresponding to the ingot tail calculated according to the steel type or production plan and optimization events; Obtain the cutting information in the runner in real time, and record the casting length and cutting machine position information during cutting; The photoelectric detection information in the flow channel is obtained in real time. When the photoelectric detection signal changes from on to off, the head of the billet just reaches the photoelectric detection point. The difference between the tracking billet length value and the actual billet length corresponding to the detection point is recorded as the correction length. According to the cutting plan or the cutting length after cutting optimization, select the appropriate correction point and the corresponding correction value, and combine the correction value to obtain the tracking billet length corresponding to the cutting point. When the tracking billet length reaches the predetermined requirement, issue the pre-pressing and main pressing instructions to the cutting machine to realize automatic cutting control. This method is applicable to the automatic cutting mode. After completing one cut, the cutting machine will automatically return to its original position, receive and execute the pre-pressing and main pressing instructions of the host computer, and automatically complete the subsequent cutting process; The length of the cut ingot is 8-11 meters, and the photoelectric detection point is 7.5 meters, 9.0 meters or 10.8 meters behind the cutting machine. When the head of the continuous casting billet reaches the photoelectric detection point, the photoelectric detection signal changes from on to off, and the difference between the actual billet length and the tracking length corresponding to the calibration point is recorded.

2. The method for online automatic cutting control of continuous casting ingot according to claim 1, characterized in that: The appropriate correction point is based on the cutting optimization calculation result, and a photoelectric detection point closest to the predefined slab planned cutting point is selected for correction.

3. The method for online automatic cutting control of continuous casting ingot according to claim 1, characterized in that: Based on the selected correction point and the obtained difference, combined with the position of the tail of the frontmost ingot, when the position of the tail in the flow channel plus the difference reaches the pre-pressure or main pressure position, the corresponding instruction is issued.

4. A casting in-line cutting device, characterized in that: It comprises a photoelectric tube, a processor and a memory, wherein the processor implements a method for online automatic cutting control of continuous casting billets as claimed in any one of claims 1 to 3 when executing a computer program stored in the memory.

5. A computer-readable storage medium, characterized in that: Used to store a computer program, wherein when the computer program is executed by a processor, a method for online automatic cutting control of continuous casting billets as described in any one of claims 1 to 3 is implemented.

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